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DRH3980A&3909A&3918A&
3918B&3921A&3921B&3926A
Hardware Description
3.4 DRH Alarm Cable
The DRH alarm cable, a shielded straight-through cable, transmits alarm signals from an
external device to an DRH so that the base station monitors the operating status of external
devices. The length of the DRH alarm cable is 5 m (16.40 ft).
Exterior
An alarm cable has a waterproofed DB15 male connector at one end and eight cord end
terminals at the other end, as shown in
Figure 3-4 Alarm cable
(1) Waterproofed DB15 male connector
Pin Assignment
Table 3-3
Table 3-3 Pin assignment for the wires of an DRH alarm cable
DRH
Alarm
Port
Dry
contact
Issue DraftA (2013-08-10)
describes the pin assignment for the wires of an DRH alarm cable.
Pin of the
Color
Waterpro
ofed
DB15
Male
Connecto
r
X1.2
White and
blue
X1.3
Blue
X1.6
White and
orange
X1.7
Orange
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd..
Figure
3-4.
(2) Cord end terminal
Type
Cord End
Terminal
Twisted
X2
pair
X3
Twisted
X4
pair
X5
3 DRH Cables
Description
SWITCH_INPUT0+
SWITCH_INPUT0-
(GND)
SWITCH_INPUT1+
SWITCH_INPUT1-
(GND)
12
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